Preparation

• Preheat your oven to 350°F (175°C) and grease a loaf pan to prevent sticking.
• In a mixing bowl, beat the unsalted butter and granulated sugar together until the mixture becomes light and fluffy, about 4 to 5 minutes.
• Add the eggs one at a time, beating well after each addition.
• In a separate bowl, sift together the all-purpose flour, baking powder, and salt.
• Gradually add the dry ingredients to the wet mixture while alternating with the milk, mixing gently until just combined.
• Stir in the vanilla extract and the zest of lemon or orange if using.
• Pour the batter into the prepared loaf pan and bake for 50 to 60 minutes, or until a toothpick inserted into the center comes out clean.
• Remove the cake from the oven and allow it to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely. Slice and serve.